Sol's headband is a power limiter concealing his mark as a gear. He's the first gear and doesn't take orders.....from NOBODY. You think Ragna would last if he ever you know, just took his shit off. He owns face with it on before Guilty Gear 2 were it's damaged from fighting Order Sol and he has a "slight"(massive) increase of power. Ragna, though is powerful, is nothing without merging with the chick with all the flying blades(forgive me lol, rushed the story a long time ago)